USMLE Step 1

United States Medical Licensing Exam Website

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NBME 15 answer links
(you might have to search for them, but there are a fair few that have been answered. Be warned though as they might not be accurate)

http://forums.studentdoctor.net/showthread.php?t=989343

http://www.usmleforum.com/files/forum/2013/1/727005.php